Answers:
1> Thuy goes to school by bus
--> How does Thuy go to school?
2> There are four people in his family (lưu ý)
--> How many people are there in his family?
3> Her eyes are brown
--> What color are her eyes?
4> I am in grade six (lưu ý lần 2)
--> Which grade are you in?
Solution :
1) How does Thuy go to school ?
2) How many people in his family ?
3) What color are her eyes ?
4) Which grade are you in ?